Angular 21 support

[matictrebusak]

Its that time of the year again:

Describe the bug

packages/apollo-angular/package.json contains

"@angular/core": "^18.0.0 || ^19.0.0 || ^20.0.0"
in peerDependencies.

To Reproduce

Try to update packages.

Additional context

We can work around this for our use of apollo-angular with:

"overrides": {
"apollo-angular": {
"@angular/core": "^18.0.0 || ^19.0.0 || ^20.0.0 || ^21.0.0"
}
}
in our package.json file.